Tid: 5 oktober 2009 kl 15.15-16.00
Plats : Seminarierummet 3733, Institutionen för matematik, KTH, Lindstedts väg 25, plan 7. Karta!
Föredragshållare: Filip Rudzki
Titel: A Fault Isolation Model Utilising Weighted Information in Military Subsystems (Examensarbete – Master thesis)
The purpose with this master thesis was to construct a model that through known information could do a fault isolation on a system. By utilising information as logs, signals, failure rates and other information such as Failure Modes, Effect and Criticality Analysis and applying this on the model, the time to find the failed component should decrease. The system of choice was the ramp on the CV 90, a infantry fighting vehicle. The fault isolation was performed by introducing Birnbaum's Measure which calculates the components probability to be critical to the system at a given time. The Criticality Importance was used to calculate the probability that the component is critical to the system when it is in a failed state. When using these methods a search scheme could be made where the most probable failed component has the highest value. Furthermore the availability of the system was studied to improve the understanding regarding importance of maintenance of the system. One suggestion mentioned in this thesis is the age replacement which includes failure times and fixed costs of a component. Another very important issue discussed in this thesis was the importance of a component, and not only the importance for the system, but which component ought to be improved regarding life length, repair time and failure rate, to make it more efficient. One of the largest problems was the lack of information and the inconsistence of values. A conclusion of the work performed is that if the available information were to be collected and stored in a structured way, the reliability models would be more accurate.
|Sidansvarig: Filip Lindskog